Synergistic light stabilizer blends for poly(vinyl chloride) polymers

ABSTRACT

tin salts formed by the reaction of di lower alkyl or aryl tin oxides and dimercapto ethyl formal and similar dimercapto compounds of the general formula ##STR1## wherein R is --(CH 2 ) m  (OCH 2 ) s  --O--(CH 2 ) m  --(OCH 2 ) p  --O-- n  (CH 2 ) m  -- wherein p is 0 or 1, m is 2 to about 6 and n is 0 to about 6 and R&#39; is lower alkyl of up to about 10 carbon atoms, or carbocyclic aryl containing one or two aromatic rings when combined with conventional tin based stabilizers show a synergistic light and heat stabilizing effect in poly(vinyl chloride) polymers.



